KAI FLY vs Lumen Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KAI FLY
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KAI FLY is a drone control application, which mainly supports basic functions such as KAIFLY series drone virtual joystick control, parameter setting, flight mode switching, accelerometer calibration, compass calibration, and one-key return to home. It also integrates functions such as map location display, GPS tracking, waypoint flight, orbital flight, virtual guardrail setting, high-definition real-time video display, high-definition shooting & video, image beautification and so on. It can also be combined with physical remote control to provide users with an accurate and interesting flight experience.
Lumen Viewer
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Your GM runs Lumen on their Mac or PC. You open Lumen Viewer on your tablet or phone. When they share a map, handout, or piece of art, it appears on your screen instantly. That's it. Lumen Viewer works with all game systems available for Lumen Screen, including D&D 5th Edition (2024), 13th Age Second Edition, and Night's Black Agents. Lumen Viewer is free. It requires a GM running Lumen Screen on the same local network. Visit lumenscreen.com to learn more.
Screenshots
Verdict
The clearest difference is update cadence: Lumen Viewer at every 2 months against KAI FLY's every 6 months. KAI FLY's advantage is iOS requirement (12.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
KAI FLY ships an update every 6 months, Lumen Viewer every 2 months. Both last shipped on October 24, 2026.
| Parameter | KAI FLY | Lumen Viewer |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 175 MB | 73 MB |
| Age rating | 4+ | 12+ |
| Developer | 荣军 杨 | Steven HAMMOND |
In-app purchases
KAI FLY
No in-app purchases
Lumen Viewer
No in-app purchases
